Infinite type;
Ruled hypersurfaces;
Local equivalence problem;
Normal forms;
Nonlinear automorphisms;
D O I:
10.1007/s12220-013-9465-y
中图分类号:
O1 [数学];
学科分类号:
0701 ;
070101 ;
摘要:
We solve the local equivalence problem for ruled hypersurfaces in C-2 at a point of infinite type by giving a normal form. We describe all ruled hypersurfaces which admit nonlinear symmetries and give their complete characterization according to the dimension of their automorphism group. As an application, we give a bound for the dimension of the stability group for a family of nonminimal hypersurfaces.